Construction Technology Of Mobile Moldbase Applied For SuTong Bridge South Approach

At the present time, the superstructure's construction of bridge can be classified into two groups. The supported frame method and the unsupported frame method. The full framing scaffolding and portal-type support is usually adopted in the construction of supporting method. The unsupported frame construction consisting of erection by cableway, cantilever concreting, prefabricated construction, incremental launching method and rotation construction. The stepping formwork equipment construction is a novelty in today's construction techniques. In Comparison with other construction method, this construction method has the advantage of no needing foundation treatment, requesting smaller bridge clearance and areas and so on. In this thesis, the stepping formwork equipment construction was emphatically introduced taking Sutong Yangtze River bridge construction as the background, the main points are as follows:(1) In this construction process, successively completed the machine design examination, the main body steel structure processing, the component transportation, scene installment and assembling, molded bugging, the loading pre-compression experiment, depositing concrete of box beam, moving the mold to put up crossing the stage. Finally has formed a set of exhaustive stepping formwork equipment construction technical process.(2) In the mold assembling process, unceasingly improved and optimized the mold assembling flow, finally accomplished the multi-channel working procedure, and reduced each box beam's construction time, thus reduced this whole construction time.(3) In this paper, the technical merit and the economic efficiency which the stepping formwork equipment brings was elaborated. Using the method of stepping formwork equipment construction, the difficulty of the weak subgrade and the aerial work was overcomed, the supported frame construction in the extreme soft area and tidelands ground was avoided, thus reduced the expense of reinforcement foundation, simultaneously the bridge superstructure's quality in construction because of the non-uniformity foundation settlement where the supported frame is was avoided.In brief, this construction craft has manifested the magnanimous attitude, the high-tech content and the economic efficiency prominent superiority in the bridge construction. In this paper the construction technical process was summarized which has the instruction significance to reality and has the precious reference to the similar construction craft.